/**
 * Copyright 2011 Honeywell Federal Manufacturing & Technologies, LLC. This material was produced under U.S. Government
 * contract DE-ACO4-01AL66850, Honeywell Federal Manufacturing & Technologies, LLC, (FM&T) with the U. S. Department of
 * Energy for the operation of the Kansas City Plant . The U.S. Government has rights to use, reproduce, and distribute
 * this software.  NEITHER THE GOVERNMENT NOR Honeywell Federal Manufacturing & Technologies, LLC, MAKES ANY WARRANTY,
 * EXPRESS OR IMPLIED, OR ASSUMES ANY LIABILITY FOR THE USE OF THIS SOFTWARE.  If software is modified to produce
 * derivative works, such modified software should be clearly marked, so as not to confuse it with the version available
 * from FM&T.
 *
 * Additionally, this program is free software; you can redistribute it and/or modify it under the terms of the GNU
 * General Public License Version 3 published by the Free Software Foundation. Accordingly, this program is distributed in
 * the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this library.
 * If not, see http://www.gnu.org/licenses/.
 */
package org.braintrain.services.util;

import org.braintrain.domain.Navigation;

import java.io.Serializable;
import java.util.Comparator;
import java.util.List;

/**
 * Compares two navigation chains.  Compares first on length of the list, then alphabetically
 * on the title of the first item.
 * 
 * @author John Ericksen
 *
 */

public class ChainListComparator implements Comparator<List<Navigation>>, Serializable {

    public int compare(List<Navigation> list1, List<Navigation> list2) {
       if(list1 != null && list2 != null)
       {
           if(list1.size() != list2.size())
           {
               return Integer.valueOf(list2.size()).compareTo(list1.size());
           }
           return list1.get(0).compareTo(list2.get(0));
       }
       return 0;
    }

}
